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Iac-08-A3.3.A1 1 Iac-08-A3.3.A1 Mission And IAC-08-A3.3.A1 IAC-08-A3.3.A1 MISSION AND NAVIGATION DESIGN FOR THE 2009 MARS SCIENCE LABORATORY MISSION Louis A. D’Amario Principal Member Engineering Staff Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California (USA) 91109 [email protected] NASA’s Mars Science Laboratory mission will launch the next mobile science laboratory to Mars in the fall of 2009 with arrival at Mars occurring in the summer of 2010. A heat shield, parachute, and rocket-powered descent stage, including a sky crane, will be used to land the rover safely on the surface of Mars. The direction of the atmospheric entry vehicle lift vector will be controlled by a hypersonic entry guidance algorithm to compensate for entry trajectory errors and counteract atmospheric and aerodynamic dispersions. The key challenges for mission design are (1) develop a launch/arrival strategy that provides communications coverage during the Entry, Descent, and Landing phase either from an X-band direct-to-Earth link or from a Ultra High Frequency link to the Mars Reconnaissance Orbiter for landing latitudes between 30 deg North and 30 deg South, while satisfying mission constraints on Earth departure energy and Mars atmospheric entry speed, and (2) generate Earth-departure targets for the Atlas V-541 launch vehicle for the specified launch/arrival strategy. The launch/arrival strategy employs a 30-day baseline launch period and a 27-day extended launch period with varying arrival dates at Mars. The key challenges for navigation design are (1) deliver the spacecraft to the atmospheric entry interface point (Mars radius of 3522.2 km) with an inertial entry flight path angle error of ±0.20 deg (3σ), (2) provide knowledge of the entry state vector accurate to ±2.8 km (3σ) in position and ±2.0 m/s (3σ) in velocity for initializing the entry guidance algorithm, and (3) ensure a 99% probability of successful delivery at Mars with respect to available cruise stage propellant. Orbit determination is accomplished via ground processing of multiple complimentary radiometric data types: Doppler, range, and Delta-Differential One-way Ranging (a Very Long Baseline Interferometry measurement). The navigation strategy makes use of up to five interplanetary trajectory correction maneuvers to achieve entry targeting requirements. The requirements for cruise propellant usage and atmospheric entry targeting and knowledge are met with ample margins. through MRO and ODY and direct-to-Earth (DTE) are INTRODUCTION significant drivers for mission design. The Mars Science Laboratory (MSL) mission will Following brief overviews of the mission and deliver a mobile science laboratory rover to the surface spacecraft in the next two sections, the remainder of the of Mars during the 2009 Mars launch opportunity. The paper will address mission and navigation design overall scientific goal of the mission is to explore and requirements and results. quantitatively assess a local region on Mars’ surface as a potential habitat for life, past or present. The MSL MISSION spacecraft will be launched in September-November 2009 from the Eastern Test Range at Cape Canaveral Launch Air Force Station in Florida on an Atlas V 541 launch The MSL spacecraft is scheduled to be launched vehicle and will arrive at Mars in July-September 2010. during the 2009 launch opportunity to Mars. The launch * The flight system consists of an Earth-Mars cruise vehicle is an Atlas V 541 consisting of a liquid oxygen stage and atmospheric entry vehicle. The entry vehicle / kerosene Common Core Booster (CCB) first stage and consists of a heatshield, backshell, descent stage a liquid oxygen / liquid hydrogen Centaur upper stage. (including sky crane), and the rover. The rover carries a The first Centaur burn establishes the 165 km x suite of 10 science instruments within the categories of 287 km, 28.9 deg inclination parking orbit, and the remote sensing, in-situ, analytical, and environmental second Centaur burn injects the spacecraft onto the (Ref. 1). The rover is powered by a Multi-Mission interplanetary transfer trajectory. The baseline 30-day Radioisotope Thermoelectric Generator (MMRTG). launch period with MRO and DTE EDL coverage During the critical ~6 min Entry, Descent, and extends from 15 September through 14 October 2009. Landing (EDL) phase, the entry system will transmit An extended launch period of up to 27 additional telemetry to the Mars Reconnaissance Orbiter (MRO) launch days extends from 15 October through and the Mars Odyssey Orbiter (ODY), both of which will be flying overhead, and also directly to Earth. The * For the Atlas nomenclature, "5" denotes five strap-on requirements for EDL telecom coverage via relay solid rocket boosters, "4" denotes a 4 m payload fairing, and "1" denotes a single-engine Centaur upper stage. 1 IAC-08-A3.3.A1 10 November 2009. The launch window on any given aimpoint, where the entry interface point is defined to day during the launch period has a duration of up to be at a Mars radius of 3522.2 km. The TCM profile is 120 min, depending on launch vehicle performance and shown in Table 1. In addition, periodic attitude the required injection energy. The launch vehicle maintenance turns are performed to provide adequate injection targets are specified as hyperbolic injection power and telecom margins, and checkouts and energy per unit mass (C3), declination of the launch calibrations of various spacecraft systems are carried asymptote (DLA), and right ascension of the launch out. The spacecraft is spin-stabilized at 2 rpm during asymptote (RLA) at the targeting interface point (TIP), cruise. defined as 5 min after spacecraft separation from the The final 45 days prior to arrival at Mars are Centaur. The injected spacecraft mass is ~4100 kg, referred to as the approach phase. During approach, the 2 2 corresponding to a maximum C3 of ~19.4 km /s . The amount of navigation tracking data increases 2 2 maximum required C3 is 17.1 km /s for the baseline launch period and 17.3 km2/s2 for the extended launch TCM Location* Description period. Excess launch vehicle performance determines TCM-1 L + 15 days Correct injection errors; remove part of the duration of the daily launch window. injection bias required for planetary protection. TCM-2 L + 120 days Correct TCM-1 errors; remove part of injection Interplanetary Cruise bias required for planetary protection. A plot of the interplanetary trajectory for the open of TCM-3 E - 60 days Correct TCM-2 errors; target to desired atmospheric entry aimpoint. the launch period is shown in Figure 1 (Ref. 2). The TCM-4 E - 8 days Correct TCM-3 errors. duration of interplanetary cruise is ~10 months. The TCM-5 E - 2 days Correct TCM-4 errors. Earth range at arrival is between 1.88 and 2.17 AU, TCM-5X E - 1 day Contingency maneuver for failure to execute depending on launch date. Detailed interplanetary TCM-5. trajectory characteristics can also be found in Ref. 2. TCM-6 E - 7 hrs Contingency maneuver: final opportunity to During interplanetary cruise, up to six Trajectory correct entry aimpoint. Correction Maneuvers (TCMs) are performed to control *Time measured from Launch (L) or Entry (E). the trajectory and adjust the atmospheric entry Table 1: TCM Profile. Figure 1: Interplanetary Trajectory for Launch on 15 September 2009. 2 IAC-08-A3.3.A1 significantly, and spacecraft activities are focused on Deep Space Network (DSN) and via relay through approach navigation, specifically TCMs 4 and 5 (and MRO and ODY using a UHF link from MSL to the TCMs 5X or 6, if necessary), as well as preparations for orbiters. EDL coverage is also possible via relay EDL, which include initializing the onboard EDL flight through the Mars Express MEX) orbiter, although this software with the latest estimate of the atmospheric option is not currently part of the baseline mission plan. entry state vector. Figure 2 shows the locations of the seven current MSL candidate landing sites, along with the landing Entry, Descent, and Landing (EDL) sites for the Viking, Mars Pathfinder, and Mars MSL is the first Mars mission to employ a guided Exploration Rover (MER) missions. Note that all the (as opposed to ballistic) hypersonic entry in order to † MSL candidate landing sites are within a latitude range reduce landing dispersions . Prior to atmospheric entry, from 30N to 30S. As this paper was being prepared, two cruise balance masses are ejected to establish a Gale Crater was added to the list of candidate landing center-of-mass offset. This causes the entry vehicle to sites, and S. Meridiani replaced the nearby N. Meridiani have a non-zero angle of attack that provides a lift landing site. The most important effect on mission and force. During the hypersonic entry period, an onboard navigation design from adding these sites is that the guidance algorithm controls the direction of the lift total range of landing longitudes is now significantly vector (by rolling or "banking" the entry vehicle) in greater. This change is an issue only with respect to the order to compensate for entry state errors and ∆V required for landing site retargeting after launch and counteract atmospheric and aerodynamic dispersions. is addressed later in this paper. This enables MSL to achieve landing dispersions of ~12 km (99%) measured radially from the target Surface landing point. The surface phase of the mission has a nominal Prior to atmospheric entry (E) a final update to the duration of one Martian year, which is 669 Sols or 687 entry state vector (if necessary) is uplinked to the Earth days. One Sol is one Martian day or 24 hrs spacecraft as late as E – 2 hrs to initialize the onboard 37 min.
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